基于铂电阻的机载测温系统校准方法改进

Improved Method for Calibration of Platinum Resistor-based Airborne Temperature Acquisition System

为了解决机载铂电阻测温系统机上校准工作量大、实施难等问题,根据机载铂电阻测温原理和校准方法,分析了对于单个测温通道在实验室与机载环境下测量结果之间的差异,提出了一种对实验室校准曲线进行修正而替代机上校准曲线的方法,并通过实验对该方法进行验证;设计了根据机载测试系统的数据文件、系统配置文件,批量修正实验室校准曲线的软件;任意选择的8个参数进行工程验证,采用原方法和本文方法进行校准得到的两组校准曲线,分别对测试数据进行处理,得到测量结果的最大偏差与量程比不超过0.27%,证明修正后实验室校准曲线与机上校准曲线基本一致,可以用作数据处理;结果证明,改进后校准方法方便、高效,校准结果满足机载测试要求,为机载参数校准提供了新思路。

In airborne situation, the calibration of platinum resistor-based airborne temperature acquisition system is of big amount of labor, and hard to operate. Based on the measuring and calibration theory of the platinum resistor--based airborne temperature acquisition system, this paper analyzes the comparison of the calibration of one single test channel between in airborne and in lab. To replace the calibra tion curve obtained in airborne, a correction method of the calibration curve obtained in lab is given. And the experiment to verify is conduc ted. The software which is to correct the calibration curves in lab which depends on the data file and configuration file of the test system is designed. The data of 8 random engineering parameters are processed with the traditional and the correction calibration curves. The maximum error between the two results is no more than 0. 27% to the measuring range. It is proved that the new calibration method is more convenient and more effective, which can meet the demands of the flight test. And this provides a new method to calibrate parameters in airborne.